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Cross Well Acoustic Tomography to Locate Abandoned Underground Mines and Subsidence Failure.

Authors
Killoran-LK
Source
Proceeds--11th Int'l Conf Gr Contr in Mng Univ of Wollongong Australia PP 499-505 :499-505
Link
NIOSHTIC No.
10011412
Abstract
The U.S. Bureau of Mines has developed a prototype cross-well acoustic logging system and complementary tomographic image reconstruction software for the detection and delineation of abandoned underground mines and associated subsidence failure in relatively shallow environments. The logging system uses a piezoelectric, cylindrical bender as an acoustic source. A triaxial accelerometer assembly, designed to be rigidly locked in the borehole, is the receiver portion of the logging system. Both the source and receiver probes operate at high frequencies, thus providing short wavelengths capable of resolving small features in most rock types. A modified van with a dual-drum wireline winch, four-channel data acquisition system, power amplifiers, and waveform generator supports field operation of the logging system. A field study was conducted at a test site in San Antonio, Texas, to demonstrate the cross-well acoustic logging system. The underlying rock at the test site is similar to stratified sediments in coal measures. First-arrival travel times were interpreted by tomographic reconstruction of the velocity field in the two- dimensional cross section between the source and receiver boreholes. The resulting image correlates well with geological borehole logging data for the test site.
Publication Date
19920101
Document Type
OP;
Fiscal Year
1992
NTIS Accession No.
NTIS Price
Identifying No.
OP 161-92
NIOSH Division
DRC;
Source Name
Proceeds--11th Int'l Conf. Gr. Contr. in Mng. Univ. of Wollongong, Australia, PP. 499-505
State
TX;
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